Trustee completely disheartened after tax conviction (5)
I believe the answer is:
tenet
'conviction' is the definition.
(I've seen this in another clue)
'trustee completely disheartened after tax' is the wordplay.
'trustee' becomes 't' (abbreviation).
'completely disheartened' becomes 'e' (I can't justify this - if you can you should give a lot more credence to this answer).
'after tax' becomes 'net' (as in net profits).
't'+'e'+'net'='TENET'
Can you help me to learn more?
(Other definitions for tenet that I've seen before include "Opinion held to be true" , "A palindromic doctrine or belief" , "Belief or doctrine - a palindrome" , "Canon" , "Doctrine, dogma, belief" .)